EP2423456B1 - Biasing working fluid flow - Google Patents

Biasing working fluid flow Download PDF

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Publication number
EP2423456B1
EP2423456B1 EP10162399.9A EP10162399A EP2423456B1 EP 2423456 B1 EP2423456 B1 EP 2423456B1 EP 10162399 A EP10162399 A EP 10162399A EP 2423456 B1 EP2423456 B1 EP 2423456B1
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EP
European Patent Office
Prior art keywords
steam turbine
condenser
working fluid
exhaust
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP10162399.9A
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German (de)
English (en)
French (fr)
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EP2423456A2 (en
EP2423456A3 (en
Inventor
Raub Warfield Smith
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General Electric Co
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General Electric Co
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Publication of EP2423456A3 publication Critical patent/EP2423456A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/165—Controlling means specially adapted therefor

Definitions

  • the subject matter disclosed herein relates to a method and system for biasing working fluid flow. More specifically, the subject matter herein relates to biasing steam flow to multiple condensing steam turbine sections.
  • thermal power plants are designed to supply each steam turbine condenser with coolant (water or air) directly from a coolant source (i.e., cooling tower, lake, ambient air, or river).
  • a coolant source i.e., cooling tower, lake, ambient air, or river.
  • LP low pressure
  • coolant is supplied to a first condenser connected to the first LP turbine, and then reused at its warmer state to cool a second condenser connected to the second LP turbine. After leaving the second condenser, the exhaust heat can be rejected to the ambient.
  • This design may reduce coolant flow, thereby requiring less pump and/or fan power, and may reduce the average condensation pressure. Further, this design may reduce the size of required heat rejection equipment (i.e., cooling tower, air condenser, etc.) by increasing the heat rejection temperature.
  • While the above-described system may provide better performance than a design with direct coolant supply to each condenser, it still suffers from shortcomings. For example, where both the first LP turbine and the second LP turbine have the same exit annulus area, performance of the system may be less than optimal. In this case, the first LP turbine (receiving lower temperature coolant) will have a lower condenser pressure than the second LP turbine (receiving warmer coolant heated by exhaust from first LP turbine). These differences in condenser pressure lead to a higher exhaust velocity and greater exhaust loss at the first LP turbine, despite the fact that both the first LP turbine and the second LP turbine receive the same amount of steam flow. This may lead to compromised performance of the power plant.
  • JP H01 106907 A describes a method and a system having the features of the preamble of the independent claims 1 and 6.
  • Two double sided low pressure (LP) turbines are arranged on a common condenser with a varying degree of vacuum, highest degree of vacuum on the coldest side of the condenser and lowest degree warmer of vacuum on the warmest side of the condenser.
  • annular diffusers are configured to adjust the flow rate of a working fluid to each of the four LP turbines to match the corresponding condenser capacity.
  • the highest flow rate is led through the LP turbine corresponding to the highest degree of vacuum condenser, the second highest flow rate is led through the LP turbine corresponding to the second highest degree of vacuum condenser, and so on. This results in different portions of the working fluid being provided to and flowing through the respective LP turbines.
  • JP S59 15610 A discloses a system including two double sided low pressure steam turbines arranged on condensers which are serially connected with regard to a cooling circuit.
  • a first set of extractors is arranged on a first double sided low pressure steam turbine and includes a first number of extraction pipes, while a second set of extractors including a second number of extraction pipes is arranged on the second double sided low pressure steam turbine.
  • the first number of extraction pipes is greater than the second number to thereby equalize the flow of the respective turbines to reduce exhaust loss.
  • a system and a method are disclosed that enable biasing of a working fluid.
  • a first aspect of the invention provides a method comprising: providing a first portion of a working fluid to a first low pressure turbine and a second portion of the working fluid to a second low pressure turbine, the second portion being greater in quantity than the first portion; processing the first portion of the working fluid in the first low pressure turbine to create a first exhaust fluid and processing the second portion of the working fluid in the second low pressure turbine to create a second exhaust fluid; providing the first exhaust fluid to a first condenser and providing the second exhaust fluid to a second condenser, wherein the second exhaust fluid is greater in quantity than the first exhaust fluid.
  • the providing the second portion greater in quantity than the first portion is performed by providing the first steam turbine with a first inlet area and the second steam turbine with a second inlet area, the first inlet area and the second inlet area being operably connected to a common admission line for directing the working fluid flow to the first steam turbine and the second steam turbine, wherein the second inlet area is larger than the first inlet area thereby causing a greater quantity of the working fluid to flow toward the second inlet area.
  • a second aspect of the invention provides a system comprising: an admission line for directing a working fluid flow equally to a first steam turbine and a second steam turbine; the first steam turbine operably connected to the admission line; the second steam turbine operably connected to the admission line; a first condenser having a first condenser coolant discharge, the first condenser operably connected to the first steam turbine exhaust; and a second condenser operably connected to the second steam turbine exhaust and the first condenser coolant discharge.
  • the first steam turbine has a first inlet area and the second steam turbine has a second inlet area, the first inlet area and the second inlet area being operably connected to the admission line, wherein the second inlet area is larger than the first inlet area to thereby cause a greater quantity of the working fluid to flow toward the second inlet area to cause the second steam turbine to receive a second portion of the working fluid that is greater in quantity than a first portion of the working fluid received by the first steam turbine.
  • biasing may include dividing a working fluid into portions, and providing more of the working fluid to one portion than to a different portion.
  • working fluid may refer to any fluid capable of performing functions described herein.
  • FIG. 1 shows a low pressure steam turbine system 100 which may be part of a larger steam turbine system (not shown).
  • Intermediate pressure turbine 110 is shown in FIG. 1 (in phantom box), however, intermediate pressure turbine 110 may act primarily as an input to low pressure steam turbine system 100.
  • Low pressure steam turbine system 100 may include an admission line 160, a first steam turbine 120 operably connected to admission line 160, and a second steam turbine 130 operably connected to admission line 160. Further, low pressure steam turbine system 100 may include a first condenser 140 having a first condenser coolant discharge 105, first condenser 140 being operably connected to first steam turbine 120.
  • Low pressure steam turbine system 100 may also include a second condenser 150 operably connected to second steam turbine 130 and first condenser 140 via, for example, a coolant line (first condenser coolant fluid stream 116).
  • First steam turbine 120 may have an inlet area 180 and second steam turbine 130 may have an inlet area 280. Additionally, first steam turbine 120 and second steam turbine 130 may be coupled via shaft 175.
  • a working fluid 102 is provided to low pressure steam turbine system 100.
  • Working fluid 102 may be, for example, exhaust from intermediate pressure turbine 110.
  • Working fluid 102 flows to admission line 160, which may divide flow of working fluid 102 into a first portion 104 and a second portion 106.
  • inlet area 280 is larger than inlet area 180.
  • a larger inlet area 280 causes a greater quantity of working fluid 102 to flow toward inlet area 280.
  • This causes second portion 106 to be greater in quantity than first portion 104.
  • this causes second steam turbine 130 to receive a greater quantity of working fluid 102 than first steam turbine 120.
  • first portion 104 may flow to first steam turbine 120 while second portion 106 may flow to second steam turbine 130.
  • First steam turbine 120 and second steam turbine 130 may process first portion 104 and second portion 106, respectively, in any conventional manner.
  • first portion 104 may expand within first steam turbine 120, applying pressure to turbine blades (not shown), thereby causing those blades to rotate and perform mechanical work.
  • second steam turbine 130 may allow for expansion, rotation and production of work using second portion 106.
  • Work performed by first steam turbine 120 and second steam turbine 130 may be coupled by shaft 175 and provided to, for example, a generator (not shown).
  • working fluid 102 may exit first steam turbine 120 as a first exhaust fluid 108, and exit second steam turbine 130 as second exhaust fluid 112.
  • first exhaust fluid 108 may flow from first steam turbine 120 to first condenser 140.
  • second exhaust fluid 112 may flow from second steam turbine 130 to second condenser 150.
  • First condenser 140 may condense first exhaust fluid 108 (gas) into a liquid form.
  • First condenser 140 may be, for example, a conventional surface condenser.
  • First condenser 140 may also use a coolant to exchange heat with first exhaust fluid 108, thereby condensing first exhaust fluid 108 and creating first condenser exhaust fluid (condensate) 142.
  • First condenser exhaust fluid 142 may then flow to a boiler 500.
  • Coolant 115 may be a fluid, and may, for example, be water. Coolant may be supplied from, for example, a cooling tower, or from ambient air. After flow through first condenser 140, coolant 115 increases in temperature and forms a first condenser coolant fluid stream 116.
  • First condenser coolant fluid stream 116 may exit first condenser 140 through first condenser coolant discharge 105, and flow to second condenser 150, which may condense second exhaust fluid 112. This may create second condenser exhaust fluid (condensate) 152, which may then flow to boiler 500. After first condenser coolant fluid stream 116 flows through second condenser 150, its temperature will rise, and it may be sent as a second condenser exit coolant 117 to, for example, a cooling tower.
  • first condenser 140 operates at a lower pressure than second condenser 150 because coolant 115 supplied to first condenser 140 is at a lower temperature (i.e., from a heat sink) than first condenser coolant fluid stream 116.
  • This disparity in operating pressure between first condenser 140 and second condenser 150 causes a higher specific volume for first exhaust fluid 108 than for second exhaust fluid 112.
  • the velocity of first exhaust fluid 108 will be greater than the velocity of second exhaust fluid 112 (which has a higher density). This prior art design results in first turbine 120 operating at a higher exhaust velocity than second turbine 130, negatively affecting performance.
  • Low pressure steam turbine system 100 may allow for a reduction in the disparity between exhaust velocities of first turbine 120 and second turbine 130 through biasing the flow of working fluid 102.
  • This system may further provide a greater quantity of second exhaust 112 to second condenser 150 than first exhaust 108 to first condenser 140, allowing for reduced exhaust loss in first condenser 140 and thereby improving the overall efficiency of low pressure steam turbine system 100. Reduced exhaust loss will be further described herein with reference to FIGS. 2-3 .
  • FIG. 2 and FIG. 3 illustrate the improvement in efficiency of low pressure steam turbine system 100 using the method described herein.
  • FIG. 2 shows exhaust loss in a conventional low pressure steam turbine 100 with equal flow of working fluid 102 to first steam turbine 120 and second steam turbine 130.
  • Point “A” represents dry exhaust loss and annulus velocity of first condenser 140 ( FIG. 1 ), while point “B” represents dry exhaust loss and annulus velocity of second condenser 150 ( FIG. 1 ).
  • FIG. 2 shows a scaled steam turbine output at 100.00 % under a conventional system utilizing equal flow of working fluid 102 between steam turbines and condensers, respectively.
  • points A and B have different dry exhaust losses and different annulus velocities.
  • FIG. 3 a graphical representation of exhaust loss in low pressure steam turbine system 100 including admission line 160 and biased flow of working fluid 102 is shown. As shown, points A and B are at substantially similar locations on the dry exhaust loss curve. As compared with FIG. 2 , the dry exhaust loss of first condenser 140 has decreased along with its annulus velocity. However, the dry exhaust loss of second condenser 150 has increased along with its annulus velocity. The decreased exhaust loss of first condenser 140 outweighs the increase in dry exhaust loss of second condenser 150, thereby increasing overall steam turbine output.
  • FIG. 3 shows a scaled steam turbine output under the embodiments shown in FIG. 1 at 100.12 %.
  • FIG. 4 shows an alternative embodiment which as such is not covered by the invention as claimed and in which first portion 104 and second portion 106 of working fluid 102 are substantially equal. This in turn provides first steam turbine 120 and second steam turbine 130 with equal amounts of working fluid 102.
  • low pressure steam turbine system 100 may include a first extractor 170 operably connected to first steam turbine 120. Extractor 170 may extract a portion 114 of first portion 104 during processing (expansion in first steam turbine 120) and before providing of first exhaust fluid 108 to first condenser 140. Extractor 170 may, for example, extract portion 114 for use in a heat exchanger in other parts of the larger steam turbine system (not shown).
  • extractor 170 serves to increase the disparity in quantity between first exhaust fluid 108 and second exhaust fluid 112 provided to first condenser 140 and second condenser 150, respectively. While a single extractor 170 is shown, it is understood that multiple extractors may be used to extract multiple portions 114 at different stages of processing within first steam turbine 120. In contrast to systems which uniformly extract the same steam flow from first steam turbine 120 and second steam turbine 130, the preferential extraction of portion 114 from steam turbine 120 in this embodiment may provide an increase in overall steam turbine output and efficiency.
  • the embodiment of FIG. 4 may have a substantially similar increase in overall steam turbine efficiency as the embodiments described with reference to FIG. 3 .
  • FIG. 5 shows another alternative embodiment which as such is not covered by the invention as claimed and which uses low pressure admission 360 during part of expansion of working fluid 102 within second steam turbine 130.
  • This embodiment may be used in combined cycle systems, whereby waste heat from a gas turbine generator 600 is used to create low pressure steam which may be supplied as low pressure admission 360 to second steam turbine 130.
  • first portion 104 and second portion 106 of working fluid 102 may be of substantially equal quantities, but low pressure admission 360 may provide for an increase in quantity of second exhaust fluid 112 from second steam turbine 130.
  • the embodiment of FIG. 5 may provide increases in overall steam turbine efficiency and output.
  • the embodiment of FIG. 5 may provide substantially similar increases as those embodiments described with reference to FIG. 3 .
  • FIG. 6 shows another alternative embodiment which as such is not covered by the invention as claimed and which uses unequal extractions from first steam turbine 120 and second steam turbine 130 before condensing of first exhaust 108 and second exhaust 112.
  • extractor 170 removes a portion 114 of first portion 104, as described with reference to FIG. 4 .
  • additional extractor 460 may also remove a portion 414 of second portion 106 from second steam turbine 130. Additional extractor 460 may remove portion 414 of second portion 106 in a similar fashion to extractor 170.
  • first portion 104 and second portion 106 of working fluid 102 may be of substantially equal quantities
  • extractor 170 and additional extractor 460 may provide unequal quantities of first exhaust 108 and second exhaust 112 to first condenser 140 and second condenser 150, respectively.
  • extracted portion 414 may be smaller in quantity than extracted portion 114.
  • the embodiment of FIG. 6 may provide a substantially similar increase in overall steam turbine efficiency and output as the embodiments described with reference to FIG. 3 .
  • FIG. 7 shows another alternate embodiment of biasing working fluid flow which as such is not covered by the invention as claimed and which uses a two-flow steam turbine 220 in low pressure steam turbine system 200.
  • Low pressure steam turbine system 200 may include an intermediate pressure turbine 210, a two-flow steam turbine 220, a first condenser 240 and a second condenser 250. Further, low pressure steam turbine system 200 may also include one or more extractors 270, 370 (additional extractor shown in phantom).
  • Working fluid 202 may be processed by two-flow steam turbine 220, producing turbine exhaust 208 and turbine exhaust 212. In this case a single two-flow steam turbine 220 may replace first steam turbine 120 and second steam turbine 130 ( FIG. 1 ).
  • Two-flow steam turbine 220 may have multiple inputs (not shown), allowing for working fluid 202 to enter side "A" and side "B" separately. As shown in FIG. 7 , sides A and B may be separate chambers within two-flow steam turbine 220, and may have separate inputs and outputs (separation shown in phantom). Similarly to embodiments shown in FIGS. 1 and 4-6 , a greater quantity of working fluid 202 may be provided to second condenser 250 (via turbine exhaust 212) than to first condenser 240 (via turbine exhaust 208).
  • extractor 270 may extract a portion 214 of working fluid 202 from side A to provide a greater quantity of working fluid 202 to second condenser 250 (side B) than to first condenser 240 (side A), as described with reference to FIG. 1 .
  • a low pressure admission may be added to side B of two-flow steam turbine 220 as described with reference to FIG. 5 .
  • the increase in overall steam turbine efficiency and output using this embodiment may be substantially similar to that discussed with reference to FIG. 3 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Control Of Turbines (AREA)
EP10162399.9A 2009-05-12 2010-05-10 Biasing working fluid flow Active EP2423456B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/464,497 US8341962B2 (en) 2009-05-12 2009-05-12 Biasing working fluid flow

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EP2423456A2 EP2423456A2 (en) 2012-02-29
EP2423456A3 EP2423456A3 (en) 2017-10-11
EP2423456B1 true EP2423456B1 (en) 2021-10-20

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EP10162399.9A Active EP2423456B1 (en) 2009-05-12 2010-05-10 Biasing working fluid flow

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US (1) US8341962B2 (ru)
EP (1) EP2423456B1 (ru)
JP (1) JP5643539B2 (ru)
RU (1) RU2534201C2 (ru)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8250848B2 (en) * 2009-05-05 2012-08-28 General Electric Company Steam turbine power system and method of assembling the same
DE102011114776B4 (de) 2011-10-01 2014-10-23 Walter Aumann Verfahren zum Betreiben eines Dampfkraftwerkes
EP2762689B1 (en) * 2013-02-05 2017-06-07 General Electric Technology GmbH Steam power plant with a second low-pressure turbine and an additional condensing system and method for operating such a steam power plant
JP6217426B2 (ja) * 2014-02-07 2017-10-25 いすゞ自動車株式会社 廃熱回収システム
US10788267B2 (en) * 2018-06-25 2020-09-29 General Electric Company Condenser system, and condensate vessel assembly for power plant

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Also Published As

Publication number Publication date
JP5643539B2 (ja) 2014-12-17
JP2010265892A (ja) 2010-11-25
EP2423456A2 (en) 2012-02-29
RU2010119071A (ru) 2011-11-20
US8341962B2 (en) 2013-01-01
EP2423456A3 (en) 2017-10-11
RU2534201C2 (ru) 2014-11-27
US20100287935A1 (en) 2010-11-18

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